Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d690352e21eed94…

MALICIOUS

PDF

37.7 KB Created: 2020-08-24 12:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0facc7c67b5e3fc9a36e4f6336f0f15e SHA-1: 15d82b5d2270b28d8721b8cdd745ac671e9a4e91 SHA-256: 3d690352e21eed94dade956ba67723e2e1922ac51f00546c1f9cb1cf123f9902
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which are designed to appear as legitimate documents or resources. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The presence of a link farm suggests an attempt to game search engine results or distribute malicious content through seemingly innocuous PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=campagnolo+chorus+cassette+manual
    • http://jifavawox.oxnardperformingarts.com/uploads/1/3/1/3/131380598/438cbbffa2.pdf
    • http://majed.brainga.com/uploads/1/3/1/1/131164392/6028015.pdf
    • http://files.nolimitsforfashion.com/uploads/1/3/1/3/131379262/4971464.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/nokez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/dadukorapukazap.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/jahangirnagar_university_admission_test_question_bank.pdf
    • https://cdn.shopify.com/s/files/1/0435/7393/6291/files/vusededuzoxunimopiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/0541/9418/files/my_favourite_things_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/93214549305.pdf
    • https://cdn.shopify.com/s/files/1/0432/2987/2292/files/geometry_proofs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9271/files/vojemotira.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6361/files/vezukixepakivigisolun.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/49096022985.pdf
    • https://cdn.shopify.com/s/files/1/0435/3831/7471/files/bsp_university_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/11711422969.pdf
    • https://cdn.shopify.com/s/files/1/0462/9463/0560/files/59913799130.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005550.bin
1bc3e405892a5cafa963c8ee7ecadb1240618fdbf4f62762b7998117992b79a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5550 5252 bytes
font_01_sfnt_off000066fd.bin
7b2953368965efc552299b2ae64fa9e90314bbc88c8e1c5cf1fdfbd2832d8f7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 10024 bytes